Catalyst component for olefin polymerization, catalyst and application thereof

Abstract

The invention provides a catalyst component for olefin polymerization, a catalyst and application thereof, and belongs to the technical field of olefin polymerization. The catalyst component contains a reaction product of the following components: (1) a magnesium-containing solid component; (2) at least one titanium-containing compound; and (3) an internal electron donor; wherein the internal electron donor contains a furan compound and a diether compound; the magnesium-containing solid component is a magnesium-containing compound as shown in a formula (I). According to the present invention, the particle size distribution of the catalyst component is narrow, the catalyst has high hydrogen regulation sensitivity and good polymerization activity, the content of the prepared polymer fine powder is low when the catalyst component is used for olefin polymerization, and the catalyst component does not contain the phthalate compound (plasticizer).

Description

Technical Field

[0001] The present invention relates to the field of olefin polymerization, and in particular to a catalyst component for olefin polymerization, a catalyst comprising the catalyst component, and application of the catalyst in olefin polymerization reactions. Background Art

[0002] Catalysts are at the core of polyolefin technology, and their advancements drive its progress. Fourth-generation Ziegler-Natta catalysts, currently the mainstream commercial catalyst, use phthalates as their internal electron donor. Studies have shown that phthalates can cause severe damage to the growth, development, and reproductive systems of animals, and may also have similar effects on humans.

[0003] High-flow polypropylene (PP) is a key area of ​​future polypropylene development due to its excellent processing properties. To obtain olefin polymers with high melt flow rates, large amounts of hydrogen are typically added during polymerization to reduce the molecular weight of the polymer. However, the upper limit of the amount of hydrogen that can be added is limited by the reactor's pressure tolerance. Adding more hydrogen requires reducing the partial pressure of the olefin gas being polymerized, which in turn reduces productivity.

[0004] In addition, attention should be paid to whether a large amount of fine powder will be produced after olefin polymerization. If there are too many fine powders in the polymer, it will bring risks to the stable operation of the polymerization unit.

[0005] Therefore, there is an urgent need to develop a non-plasticizing catalyst with high hydrogen sensitivity. At the same time, the catalyst should maintain appropriate polymerization activity and reduce the fine powder content in the polymer, thereby having good application performance. Summary of the Invention

[0006] An object of the present invention is to provide a catalyst component for olefin polymerization and a preparation method thereof, wherein the catalyst component has a narrow particle size distribution, high hydrogen modulation sensitivity and high polymerization activity, and does not contain phthalate compounds (plasticizers).

[0007] Another object of the present invention is to provide a catalyst for olefin polymerization comprising the above catalyst component and its use in olefin polymerization. When the catalyst is used for propylene polymerization, the polymer produced has a low fine powder content.

[0008] Specifically, the present invention provides a catalyst component for olefin polymerization, the catalyst component comprising the reaction product of:

[0009] (1) a magnesium-containing solid component;

[0010] (2) at least one titanium-containing compound; and

[0011] (3) Internal electron donor;

[0012] Wherein, the internal electron donor contains a furan compound and a diether compound;

[0013] The magnesium-containing solid component is a magnesium-containing compound represented by formula (I);

[0014]

[0015] In formula (I), R1 is a C1-C6 straight-chain or branched alkyl group; R2 and R3 are the same or different and are independently hydrogen or a C1-C5 straight-chain or branched alkyl group, wherein the hydrogen on the alkyl group may be optionally replaced by a halogen atom; X is chlorine or bromine; m is 0.1-1.9, n is 0.1-1.9, m+n=2, 0 <q≤0.5。

[0016] The present invention also provides a method for preparing the catalyst component for olefin polymerization.

[0017] The present invention also provides a catalyst for olefin polymerization, the catalyst comprising:

[0018] (i) a catalyst component, which is at least one of the catalyst components for olefin polymerization described above;

[0019] (ii) at least one alkylaluminum compound; and

[0020] (iii) Optional external electron donor.

[0021] The present invention also provides application of the catalyst for olefin polymerization in olefin polymerization reactions.

[0022] During the research process, the present invention unexpectedly discovered that when the internal electron donor contains a furan compound and a diether compound, and the magnesium-containing solid component is the magnesium-containing solid component described in the present invention, the catalyst's hydrogen sensitivity can be effectively improved, and the catalyst has a narrow particle size distribution, high activity, and a low fine powder content in the prepared polymer. In addition, the present invention also found that according to a preferred embodiment of the present invention, when a furan compound and a diether compound are used as internal electron donors to prepare a catalyst component for olefin polymerization, when the molar ratio of the furan compound to the diether compound is 0.1 to 1.5:1, preferably 0.15 to 1.2:1, and more preferably 0.2 to 1.0:1, the two internal electron donors can be perfectly matched, thereby more effectively improving the catalyst's hydrogen sensitivity.

[0023] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1This is an optical microscope image of the olefin polymerization catalyst support Z1 obtained in Preparation Example 1 of the present invention. DETAILED DESCRIPTION

[0025] The following is a detailed description of the specific embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0026] The present invention provides a catalyst component for olefin polymerization, the catalyst component comprising the reaction product of the following components:

[0027] (1) a magnesium-containing solid component;

[0028] (2) at least one titanium-containing compound; and

[0029] (3) Internal electron donor;

[0030] Wherein, the internal electron donor contains a furan compound and a diether compound;

[0031] The magnesium-containing solid component has a structure shown in formula (I):

[0032]

[0033] In formula (I), R1 is a C1-C6 straight-chain or branched alkyl group; R2 and R3 are the same or different and are independently hydrogen or a C1-C5 straight-chain or branched alkyl group, wherein the hydrogen on the alkyl group may be optionally replaced by a halogen atom; X is chlorine or bromine; m is 0.1-1.9, n is 0.1-1.9, m+n=2, 0 <q≤0.5。

[0034] The raw material for synthesizing the magnesium-containing solid component contains sulfur, a magnesium halide of the general formula MgXY, a compound of the general formula ROH, and an oxirane compound; in the general formula MgXY, X is a halogen, and Y is a halogen or a C1-C6 alkyl group; in the general formula ROH, R is a C1-C8 alkyl group or a C3-C8 cycloalkyl group; the structure of the oxirane compound is shown in formula (II):

[0035]

[0036] wherein R5 and R6 are each independently hydrogen, a C1-C5 alkyl group or a C1-C5 halogenated alkyl group.

[0037] According to the present invention, the content of the above-mentioned components in the magnesium-containing solid component can be selected and varied within a wide range. For example, based on 1 mol of the magnesium halide with the general formula MgXY, the amount of sulfur is 0.0001 to 0.1 mol, the amount of the compound with the general formula ROH is 4 to 30 mol, and the amount of the oxirane compound with the structure shown in formula (II) is 1 to 10 mol; preferably, based on 1 mol of the magnesium halide with the general formula MgXY, the amount of the compound with the general formula ROH is 6 to 20 mol, and the amount of the oxirane compound with the structure shown in formula (II) is 2 to 6 mol.

[0038] According to the present invention, the sulfur is anhydrous sulfur or sulfur containing crystal water, sulfur or sulfur bromide or sulfur iodide, preferably sulfur.

[0039] According to the present invention, in the general formula MgXY, X is preferably chlorine or bromine, and Y is preferably chlorine, bromine, C1-C5 alkyl, C1-C5 alkoxy, C6-C 10 Aryl or C6~C 10 The C1-C5 alkyl group may be, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl or neopentyl; the C1-C5 alkoxy group may be, for example, methoxy, ethoxy, propoxy, isopropoxy, butoxy or isobutoxy; the C6-C 10 The aryl group may be, for example, phenyl, o-tolyl, m-tolyl, p-tolyl, o-ethylphenyl, m-ethylphenyl, p-ethylphenyl or naphthyl. 10 The aryloxy group may be, for example, a phenoxy group or a naphthoxy group.

[0040] The magnesium halide of the general formula MgXY may be a single magnesium halide or a mixture of multiple magnesium halides. Specific examples of the magnesium halide of the general formula MgXY may include, but are not limited to, one or more of magnesium chloride, magnesium bromide, phenoxymagnesium chloride, isopropoxymagnesium chloride, and n-butoxymagnesium chloride. From the perspective of raw material availability, magnesium chloride is preferred.

[0041] According to the present invention, in the general formula ROH, R is preferably a C1-C8 alkyl group; the C1-C8 alkyl group may be, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, neopentyl, hexyl, isohexyl, heptyl, isoheptyl, octyl, or isooctyl. Specific examples of the compound of the general formula ROH may include, but are not limited to, one or more of ethanol, propanol, isopropanol, n-butanol, isobutanol, amyl alcohol, isopentanol, n-hexanol, n-octanol, and 2-ethylhexanol.

[0042] According to the present invention, in the oxirane compound represented by formula (II), R5 and R6 are preferably each independently hydrogen, a C1-C3 alkyl group, or a C1-C3 haloalkyl group. Specific examples of the oxirane compound may include, but are not limited to, one or more of ethylene oxide, propylene oxide, butylene oxide, epichlorohydrin, epichlorobutane, epibromohydrin, and epibromobutane.

[0043] According to a preferred embodiment of the present invention, the average particle diameter of the magnesium-containing solid component is preferably 12 to 30 microns, and the particle size distribution is less than 1.2, preferably 0.2 to 0.8. In the present invention, the average particle diameter and particle size distribution of the olefin polymerization catalyst support (magnesium-containing solid component) can be measured using a Master Sizer 2000 laser particle size analyzer (manufactured by Malvern Instruments Ltd).

[0044] According to the present invention, the water contained in the olefin polymerization catalyst carrier comes from trace water in the synthetic raw materials and the reaction medium.

[0045] The method for preparing the olefin polymerization catalyst carrier of the present invention comprises the following steps:

[0046] (a) mixing sulfur, a magnesium halide of the general formula MgXY, a compound of the general formula ROH, and an optional inert liquid medium and heating the mixture to obtain a liquid mixture;

[0047] (b) emulsifying the liquid mixture obtained in step (a), and contacting the emulsified product with an oxirane compound for reaction.

[0048] In the general formula MgXY, X is a halogen, and Y is a halogen or a C1-C6 alkyl group; in the general formula ROH, R is a C1-C8 alkyl group or a C3-C8 cycloalkyl group; the structure of the oxirane compound is shown in formula (II):

[0049]

[0050] Among them, the types of magnesium halide with the general formula MgXY, compound with the general formula ROH, sulfur, and ethylene oxide compounds have been described above and will not be repeated here.

[0051] According to the present invention, based on 1 mol of magnesium halide with the general formula MgXY, the amount of sulfur used is 0.0001 to 0.1 mol, the amount of the compound with the general formula ROH used is 4 to 30 mol, and the amount of the oxirane compound with the structure shown in formula (II) used is 1 to 10 mol; preferably, based on 1 mol of magnesium halide with the general formula MgXY, the amount of the compound with the general formula ROH used is 6 to 20 mol, and the amount of the oxirane compound with the structure shown in formula (II) used is 2 to 6 mol.

[0052] According to the present invention, a trace amount of water in the above reactants can also participate in the reaction of forming the olefin polymerization catalyst support.

[0053] According to the present invention, a surfactant can be added to the liquid mixture described in step (a), and the surfactant is selected from the group consisting of polyvinyl pyrrolidone (PVP), polyethylene glycol (PEG), polyacrylic acid, polyacrylate, polystyrene sulfonate, naphthalenesulfonic acid formaldehyde condensate, condensed alkyl phenyl ether sulfate, condensed alkylphenol polyoxyethylene ether phosphate, oxyalkyl acrylate copolymer modified polyethyleneimine, 1-dodecan-4-vinylpyridinium bromide polymer, polyvinyl benzyltrimethylamine salt, polyvinyl alcohol, polyacrylamide, polyethylene oxide propylene oxide block copolymer, polyvinyl pyrrolidone vinyl acetate copolymer, alkylphenyl polyoxyethylene ether and polyalkyl methacrylate compounds, or a combination thereof, preferably polyvinyl pyrrolidone, polyvinyl pyrrolidone vinyl acetate copolymer and polyethylene glycol, or a combination thereof.

[0054] According to the present invention, in step (a), the conditions for heating the mixture of sulfur, the magnesium halide of the general formula MgXY, the compound of the general formula ROH, and optionally the inert liquid medium are not particularly limited, as long as the heating conditions enable the magnesium halide of the general formula MgXY to melt and fully react with the sulfur. Generally, the heating conditions include: a temperature of 80 to 120°C for 0.5 to 5 hours; preferably, the temperature is 80 to 100°C for 0.5 to 3 hours.

[0055] According to the present invention, the amount of the inert liquid medium can be selected based on the amount of magnesium halide with the general formula MgXY. Generally, based on 1 mol of magnesium halide with the general formula MgXY, the amount of the inert liquid medium can be 0.8 to 10 L, preferably 2 to 8 L. The inert liquid medium can be various liquid media commonly used in the art that do not chemically interact with the reactants and reaction products. For example, the inert liquid medium can be silicone oil and / or an inert liquid hydrocarbon solvent. Specifically, the inert liquid medium can be one or more of kerosene, paraffin oil, vaseline oil, white oil, methyl silicone oil, ethyl silicone oil, methylethyl silicone oil, phenyl silicone oil and methylphenyl silicone oil. The inert liquid medium of the present invention is particularly preferably white oil.

[0056] According to the present invention, the liquid mixture obtained in step (a) can be emulsified using various methods known to those skilled in the art. For example, the liquid mixture can be emulsified by subjecting it to low-speed shearing or high-speed shearing. The stirring rate of the low-speed shearing is generally 400 to 800 rpm. The high-speed shearing method is well known to those skilled in the art, such as the high-speed stirring method disclosed in CN1151183C (i.e., stirring the solution containing the liquid magnesium halide adduct at a speed of 2000 to 5000 rpm). In addition, the liquid mixture can also be emulsified with reference to the methods disclosed in the following patents: CN1267508C discloses that a solution containing a liquid magnesium halide adduct is subjected to rotational dispersion in a supergravity bed (the rotation speed may be 100 to 3000 rpm); CN1463990A discloses that a solution containing a liquid magnesium halide adduct is output in an emulsifier at a speed of 1500 to 8000 rpm; US6020279 discloses that a solution containing a liquid magnesium halide adduct is emulsified by a spray method.

[0057] According to the present invention, in step (b), the conditions for the contact reaction of the emulsified product with the ethylene oxide compound can be various existing conditions that can form an olefin polymerization catalyst support. For example, the contact reaction conditions include a temperature of 50 to 120° C. and a time of 20 to 60 minutes; preferably, the temperature is 60 to 100° C. and the time is 20 to 50 minutes.

[0058] According to the present invention, the method may further include performing solid-liquid separation on the product obtained by the contact reaction, washing the solid-phase product and drying it. The solid-liquid separation may be any existing method capable of achieving separation of the solid phase and the liquid phase, such as suction filtration, filter press or centrifugal separation. Preferably, the solid-liquid separation method is filter press. The present invention does not particularly limit the conditions for filter press, and the separation of the solid phase and the liquid phase is achieved as fully as possible. The washing may be performed by methods well known to those skilled in the art, for example, the solid-phase product obtained may be washed with an inert hydrocarbon solvent (for example, pentane, hexane, heptane, petroleum ether and gasoline). The present invention does not particularly limit the conditions for the drying, for example, the drying temperature may be 20 to 70°C, and the drying time may be 0.5 to 10 hours. According to the present invention, the drying may be performed under normal pressure or reduced pressure.

[0059] Preferably, the magnesium-containing solid component particles obtained in the above process of preparing the magnesium-containing solid component are washed with an inert hydrocarbon solvent (such as hexane, heptane, octane, decane, toluene, etc.) and dried before being used in the subsequent step to prepare the catalyst component for olefin polymerization.

[0060] According to the present invention, when the internal electron donor contains a furan compound and a diether compound, a certain synergistic effect can be produced. Based on the amount of the internal electron donor, the total content of the furan compound and the diether compound in the internal electron donor is preferably 70 wt % to 100 wt %, more preferably 80 wt % to 100 wt %, further preferably 90 wt % to 100 wt %, and most preferably 100 wt %.

[0061] The present invention has found that, relative to each mole of diether compound, when the molar ratio of the furan compound to the diether compound is (0.1-1.5):1, preferably (0.15-1.2):1, and more preferably (0.2-1.0):1, the two can be synergistically formulated better. Combined with the solid component of the present invention, a catalyst with higher hydrogen sensitivity and better overall performance is obtained.

[0062] In the present invention, the furan compound may be any furan compound that can be used as an electron donor in an olefin polymerization catalyst. Preferably, the furan compound is selected from at least one of the furan compounds represented by formula (III):

[0063]

[0064] In formula (III), R1 and R3 are each independently selected from hydrogen, C1 to C 20 Straight or branched alkyl, C3~C 20 Cycloalkyl, C6~C 20Aryl or C7~C 20 Arylalkyl or C7~C 20 R2 and R4 are each independently selected from C1 to C 10 Straight or branched alkyl, C3~C 10 Cycloalkyl, C6~C 10 Aryl or C7~C 10 Arylalkyl or C7~C 10 Alkaryl.

[0065] Preferably, the furan compound is selected from (3R,3aR,6S,6aR)-3-methoxy-6-propoxyhexahydrofuro[3,2-b]furan, (3R,3aR,6S,6aR)-3-methoxy-6-ethoxyhexahydrofuro[3,2-b]furan, (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuro[3,2-b]furan, ( At least one of (3R,3aR,6S,6aR)-3,6-diethoxyhexahydrofuro[3,2-b]furan and (3R,3aR,6S,6aR)-3,6-dipropoxyhexahydrofuro[3,2-b]furan; more preferably, the furan-containing compound is (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuro[3,2-b]furan.

[0066] According to the present invention, the diether compound can be any diether compound that can serve as an electron donor in a catalyst for olefin polymerization. Preferably, the diether compound is selected from at least one of the diether compounds represented by formula (IV).

[0067] R 1 R 2 C(CH2OR 3 )(CH2OR 4 ) Formula (Ⅳ)

[0068] Among them, R 1 and R 2 Each independently selected from hydrogen, C1-C 20 Straight or branched alkyl, C3~C 20 Cycloalkyl, C6~C 20 Aryl, C7~C 20 Arylalkyl and C7~C 20 One of the alkylaryl groups, the groups may be optionally linked to form a ring; R 3 and R 4 Each independently selected from C1 to C 10 of alkyl.

[0069] Preferably, the diether compound is selected from 2-(2-ethylhexyl)-1,3-dimethoxypropane, 2-isopropyl-1,3-dimethoxypropane, 2-butyl-1,3-dimethoxypropane, 2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-1,3-dimethoxypropane, 2-phenyl-1,3-dimethoxypropane, 2-(2-phenylethyl)-1,3-dimethoxypropane, 2-(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-(p-chlorophenyl)-1,3-dimethoxypropane, 2-(diphenylmethyl)-1,3-dimethoxypropane, 2,2-dicyclohexyl-1,3-dimethoxypropane, 2,2-dicyclopentyl-1,3-dimethoxypropane, 2,2-diethyl-1,3-dimethoxypropane, 2,2-dipropyl-1,3-dimethoxypropane, 2,2-diisopropyl-1,3-dimethoxypropane, 2,2-dibutyl-1,3-dimethoxypropane, 2-methyl-2-propyl-1,3-dimethoxypropane, 2-methyl-2-benzyl-1,3-dimethoxypropane, 2-methyl-2-ethyl-1,3-dimethoxypropane, 2-methyl-2-isopropyl-1,3-dimethoxypropane, 2-methyl-2-phenyl-1,3-dimethoxypropane, 2-methyl-2-cyclohexyl-1,3-dimethoxypropane, 2,2 -bis(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-methyl-2-isobutyl-1,3-dimethoxypropane, 2-methyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, 2,2-diphenyl-1,3-dimethoxypropane, 2,2-dibenzyl-1,3-dimethoxypropane, 2,2-bis(cyclohexylmethyl)-1,3-dimethoxypropane, 2-isobutyl-2-isopropyl-1,3-dimethoxypropane, 2-(1-methylbutyl)-2-isopropyl-1,3-dimethoxypropane, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, At least one of 2-phenyl-2-isopropyl-1,3-dimethoxypropane, 2-phenyl-2-sec-butyl-1,3-dimethoxypropane, 2-benzyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclohexyl-2-sec-butyl-1,3-dimethoxypropane, 2-isopropyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-cyclohexylmethyl-1,3-dimethoxypropane and 9,9-dimethoxymethylfluorene.

[0070] Most preferably, the diether compound is 2-isopropyl-2-isopentyl-1,3-dimethoxypropane and / or 9,9-dimethoxymethylfluorene.

[0071] In the present invention, the titanium compound can be any titanium compound commonly used in the art. For example, the titanium compound can be selected from the group consisting of the general formula Ti(OR4): 4-a X a Titanium compounds, wherein R4 can be C1 to C 14 wherein the aliphatic hydrocarbon group is preferably a C1-C8 alkyl group, such as methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, etc.; X can be a halogen, such as F, Cl, Br, I, or any combination thereof; and a is an integer from 0 to 4. Preferably, the titanium compound is at least one selected from titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, tetrabutoxytitanium, tetraethoxytitanium, monochlorotributoxytitanium, dichlorodibutoxytitanium, trichloromonobutoxytitanium, monochlorotriethoxytitanium, dichlorodiethoxytitanium, and trichloromonoethoxytitanium.

[0072] In the catalyst component of the present invention, the content of magnesium element is 2 to 18 parts by weight, preferably 3 to 16 parts by weight, calculated per part by weight of titanium element; the content of internal electron donor is 2 to 17 parts by weight, preferably 3 to 15 parts by weight, calculated per part by weight of titanium element.

[0073] The present invention also provides a method for preparing a catalyst component for olefin polymerization, the method comprising the following steps:

[0074] The process of contacting the prepared magnesium-containing solid component with a titanium compound for reaction comprises: suspending the magnesium-containing solid component in a titanium compound raw material at a temperature of -30°C to 0°C, and then heating the temperature to a reaction temperature (about 60-130°C) for a reaction of 0.1 to 5 hours. In the method for preparing a catalyst component for olefin polymerization, the internal electron donor is added in one or more time periods before, during, and after the reaction of the magnesium source and the titanium source. The time period before the reaction of the magnesium source and the titanium source refers to the time period after the magnesium source is added to the reactor and before the temperature is raised to the reaction temperature. Preferably, the internal electron donors of the furan compound and the diether compound are added during the process of heating the mixture of the magnesium-containing solid component and the titanium compound.

[0075] Preferably, after reacting the magnesium-containing solid component with the titanium compound, the method for preparing the catalyst component further comprises filtering off the liquid and recovering the solid, then treating the recovered solid with a liquid titanium compound (e.g., titanium tetrachloride) one or more times; and then washing the resulting solid catalyst component multiple times with a hydrocarbon solvent. The hydrocarbon solvent may be selected from aliphatic, aromatic, or alicyclic hydrocarbons, such as hexane, heptane, octane, decane, toluene, and the like.

[0076] In the preparation process of the catalyst component of the present invention, based on per mole of magnesium, the dosage of the titanium compound can be 5 to 220 moles, preferably 10 to 200 moles; based on per mole of magnesium, the dosage of the internal electron donor can be 0.05 to 1.2 moles, preferably 0.07 to 1.0 moles, and more preferably 0.1 to 0.8 moles.

[0077] The types and dosages of the furan compounds and diether compounds, and the types of the titanium compounds have been described above and will not be elaborated here.

[0078] The present invention also provides a catalyst component for olefin polymerization prepared by the above method.

[0079] The present invention also provides a catalyst for olefin polymerization, which catalyst contains:

[0080] (i) A catalyst component, which is the above catalyst component for olefin polymerization provided by the present invention;

[0081] (ii) At least one alkylaluminum compound; and

[0082] (iii) An optional external electron donor.

[0083] In the catalyst for olefin polymerization, the alkylaluminum compound can be various alkylaluminum compounds conventionally used in the art. For example, the general formula of the alkylaluminum can be AlR n X 3-n , where R is an alkyl group of C1 - C8, the hydrogen on the alkyl group is optionally substituted by a halogen atom, X is a halogen, and n is an integer of 0 < n ≤ 3; specific examples of the alkyl group of C1 - C8 can include but are not limited to: methyl, ethyl, propyl, n-butyl, isobutyl, pentyl, hexyl, n-heptyl, n-octyl, and the halogen can be fluorine, chlorine, bromine, iodine.

[0084] Specifically, the alkylaluminum compound can be selected from one or more of triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, diethylaluminum chloride, diisobutylaluminum chloride, di-n-butylaluminum chloride, di-n-hexylaluminum chloride, ethylaluminum dichloride, isobutylaluminum dichloride, n-butylaluminum dichloride, and n-hexylaluminum dichloride.

[0085] According to the present invention, the dosage of the alkylaluminum compound can be the conventional dosage in the art. Preferably, in the catalyst for olefin polymerization, the molar ratio of the catalyst component for olefin polymerization based on titanium element and the alkylaluminum based on aluminum element is 1:(1 - 2000), preferably 1:(20 - 500).

[0086] In the catalyst for olefin polymerization, the external electron donor can be various external electron donors commonly used in the art. For example, the external electron donor can be selected from carboxylic acids, carboxylic anhydrides, carboxylates, ketones, ethers, alcohols, lactones, organophosphorus compounds and organosilicon compounds.

[0087] Preferably, the external electron donor contains at least one Si-OR bond and has the general formula (R 17 ) x (R 18 ) y Si(OR 19 ) z Silicon compounds, wherein R 17 、R 18 and R 19 Independently C1~C 18 The hydrocarbon group optionally contains heteroatoms, x and y are each independently an integer of 0 to 2, z is an integer of 1 to 3, and the sum of x, y and z is 4. Preferably, R 17 、R 18 Independently C3~C 10 Alkyl, C3~C 10 The cycloalkyl group optionally contains heteroatoms; R 19 C1~C 10 The alkyl group optionally contains heteroatoms.

[0088] Specifically, the external electron donor can be selected from, for example, cyclohexylmethyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, diphenyldimethoxysilane, methyl-tert-butyldimethoxysilane, dicyclopentyldimethoxysilane, 2-ethylpiperidinyl-2-tert-butyldimethoxysilane, (1,1,1-trifluoro-2-propyl)-2-ethylpiperidinyldimethoxysilane, and (1,1,1-trifluoro-2-propyl)-methyldimethoxysilane. These external electron donors can be used alone or in combination.

[0089] According to the present invention, the amount of the external electron donor can be a conventional amount in the art. Preferably, in the catalyst for olefin polymerization, the molar ratio of the external electron donor to the amount of the alkyl aluminum calculated as aluminum element can be 1:(1-500), preferably 1:(2-200).

[0090] According to the present invention, in the preparation process of the catalyst for olefin polymerization, the alkyl aluminum and the optional external electron donor compound can be mixed with the catalyst components for olefin polymerization separately and then reacted, or the alkyl aluminum and the optional external electron donor can be mixed in advance and then mixed with the catalyst components for olefin polymerization and reacted.

[0091] According to the present invention, when the catalyst for olefin polymerization is used for olefin polymerization, the catalyst components for olefin polymerization, alkyl aluminum, and optional external electron donor can be added to the polymerization reactor separately, or mixed and added to the polymerization reactor, or the olefin can be prepolymerized using a prepolymerization method known in the industry and then added to the polymerization reactor.

[0092] The present invention also provides application of the catalyst for olefin polymerization in olefin polymerization reactions.

[0093] The improvement of the present invention lies in the use of a new catalyst for olefin polymerization, while the specific type of olefin, the polymerization reaction method and conditions of the olefin can be the same as those in the prior art.

[0094] According to the present invention, the above catalyst is particularly suitable for the general formula CH2=CHR (wherein R is hydrogen, C1-C6 alkyl or C6-C 12 Homopolymerization and copolymerization of olefins containing aryl groups.

[0095] According to the present invention, the olefin polymerization reaction can be carried out according to existing methods. Specifically, the polymerization reaction can be carried out under the protection of an inert gas in a liquid monomer or an inert solvent containing the polymerizable monomer, in the gas phase, or through a combined polymerization process in the gas and liquid phases. The polymerization reaction temperature can generally be 0 to 150°C, preferably 60 to 90°C. The polymerization reaction pressure can be atmospheric pressure or higher, for example, 0.01 to 10 MPa, preferably 0.01 to 6 MPa, and more preferably 0.1 to 4 MPa. The pressures used in the present invention refer to gauge pressure. During the polymerization process, hydrogen can be added to the reaction system as a polymer molecular weight regulator to adjust the molecular weight and melt index of the polymer. Furthermore, the types and amounts of the inert gases and solvents used in the olefin polymerization process are well known to those skilled in the art and will not be elaborated upon here.

[0096] The present invention will be further described in detail below by the following examples.

[0097] 1. The average particle diameter and particle size distribution of the catalyst components and their carriers were measured using a Masters Sizer 2000 particle size analyzer (manufactured by Malvern Instruments Ltd);

[0098] 2. The surface morphology of the magnesium-containing solid component was observed using an Eclipse E200 optical microscope commercially available from Nikon Corporation;

[0099] 3. Polymer melt index: measured according to GB3682-2000 at 230°C and 2.16 kg load.

[0100] 4. The fine powder content of the polymer was tested using a MICROTRAC MRB camsizer P4. The data in the table refers to the polymer content with a mesh size of less than 100 after sieving using a standard sieve, that is, the polymer content that can pass through a 150μm sieve.

[0101] Preparation Example 1 Magnesium-containing solid component (catalyst support)

[0102] This preparation example is used to illustrate the olefin polymerization catalyst carrier and the preparation method thereof provided by the present invention.

[0103] In a 0.6L reactor, 0.08 mol of magnesium chloride, 0.96 mol of ethanol, 1 g of sulfur, and 0.5 g of PVP (polyvinylpyrrolidone) as a surfactant were added and the mixture was heated to 90°C with stirring. After 2 hours of constant temperature reaction, 0.48 mol of epichlorohydrin was added. After half an hour of reaction, the mixture was filtered and washed five times with hexane and dried in vacuo to obtain the catalyst support Z1 for olefin polymerization.

[0104] The average particle diameter (D50) of the olefin polymerization catalyst carrier Z1 is 15 microns, and the particle size distribution ((D90-D10) / D50) is 0.6. Figure 1 As shown, observation under an optical microscope shows that the particles of the olefin polymerization catalyst carrier Z1 are relatively regular in morphology, smooth in surface, and are basically spherical. The particle size distribution is relatively concentrated, and there are basically no irregular particles.

[0105] According to GC-MS, elemental analysis and NMR characterization, the structural formula of Z1 is:

[0106]

[0107] Preparation Example 2

[0108] This preparation example is used to illustrate the olefin polymerization catalyst carrier and the preparation method thereof provided by the present invention.

[0109] In a 0.6L reactor, 300mL of white oil, 0.08mol of magnesium chloride, 0.48mol of ethanol, 0.3g of sulfur chloride, and 1g of PVP (polyvinylpyrrolidone) as a surfactant were added and the temperature was raised to 100°C with stirring. After 1 hour of constant temperature reaction, 0.16mol of epichlorohydrin was added. After 20 minutes of reaction, the mixture was filtered. The filtered product was washed five times with hexane and finally vacuum dried to obtain olefin polymerization catalyst support Z2.

[0110] The average particle diameter (D50) of the olefin polymerization catalyst support Z2 was 18 microns, and the particle size distribution ((D90-D10) / D50) was 0.7. Observation under an optical microscope revealed that the particles of the olefin polymerization catalyst support Z2 were relatively regular, smooth, and essentially spherical. The particle size distribution was relatively concentrated, and there were essentially no irregularly shaped particles.

[0111] Example 1

[0112] This embodiment is used to illustrate the catalyst component for olefin polymerization and its preparation method, as well as the catalyst for olefin polymerization and its application according to the present invention.

[0113] (1) Preparation of catalyst components

[0114] In a 300 mL glass reaction bottle, add 80 mL of titanium tetrachloride, cool to -20°C, add 8 g of the above-mentioned solid component Z1, and heat to 115°C. During the heating process, add 2.3 mmol of (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuro[3,2-b]furan and 8.9 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane. Maintain at 110°C for 1 hour, filter out the liquid, wash with titanium tetrachloride, then with hexane, and vacuum dry to obtain solid catalyst component Cat-1.

[0115] (2) Propylene liquid phase bulk polymerization

[0116] Liquid-phase bulk polymerization of propylene was carried out in a 5-liter stainless steel autoclave. Under nitrogen, 5 ml of a hexane solution of triethylaluminum (0.5 mmol / ml), 1 ml of a hexane solution of cyclohexylmethyldimethoxysilane (CHMMS) (0.1 mmol / ml), and 7.5 mg of the aforementioned solid catalyst, Cat-1, were added sequentially to the autoclave. The autoclave was closed, and hydrogen and 2.3 L of liquid propylene were added. The temperature was raised to 70°C, and the reaction was continued for 1 hour. The temperature was then lowered, the pressure was released, and the product was discharged. The resulting propylene homopolymer was dried, weighed, and analyzed. The results are shown in Table 1.

[0117] Example 2

[0118] This embodiment is used to illustrate the catalyst component for olefin polymerization and its preparation method, as well as the catalyst for olefin polymerization and its application according to the present invention.

[0119] The catalyst component was prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 1, except that the solid component added was Z2. During the heating process, 3.2 mmol of (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuro[3,2-b]furan and 7.0 mmol of 9,9-dimethoxymethylfluorene were added to obtain a solid catalyst component Cat-2. The obtained propylene homopolymer was dried, weighed, and analyzed. The results are shown in Table 1.

[0120] Example 3

[0121] This embodiment is used to illustrate the catalyst component for olefin polymerization and its preparation method, as well as the catalyst for olefin polymerization and its application according to the present invention.

[0122] The catalyst component was prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 1, except that the solid component added was Z2. During the heating process, 4.7 mmol of (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuro[3,2-b]furan and 6.5 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane were added to obtain a solid catalyst component Cat-3. The obtained propylene homopolymer was dried, weighed, and analyzed. The results are shown in Table 1.

[0123] Example 4

[0124] This embodiment is used to illustrate the catalyst component for olefin polymerization and its preparation method, as well as the catalyst for olefin polymerization and its application according to the present invention.

[0125] A catalyst component was prepared and liquid-phase bulk polymerization of propylene was carried out according to the method of Example 1, except that 5.8 mmol of (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuro[3,2-b]furan and 6.3 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane were added during the heating process to obtain a catalyst component Cat-4 for olefin polymerization. The obtained propylene homopolymer was dried, weighed, and analyzed. The results are shown in Table 1.

[0126] Comparative Example 1

[0127] This comparative example is used to illustrate a catalyst component for olefin polymerization and a preparation method thereof, and a catalyst for olefin polymerization and an application thereof.

[0128] A catalyst component was prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 1, except that, during the preparation of the catalyst component, 8 g of a magnesium halide support (prepared according to the method disclosed in Example 1 of CN1267508C) was added instead of the solid component Z1, and the (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuro[3,2-b]furan was replaced by an equal molar amount of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane to obtain a catalyst component DCat-1 for olefin polymerization. The obtained propylene homopolymer was dried, weighed, and analyzed. The results are shown in Table 1.

[0129] Comparative Example 2

[0130] This comparative example is used to illustrate a catalyst component for olefin polymerization and a preparation method thereof, and a catalyst for olefin polymerization and an application thereof.

[0131] A catalyst component was prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 1, except that, during the preparation of the catalyst component, 8 g of a magnesium halide support (prepared according to the method disclosed in Example 1 of CN1267508C) was added instead of the solid component Z1, and the 2-isopropyl-2-isopentyl-1,3-dimethoxypropane was replaced by an equal molar amount of (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuro[3,2-b]furan to obtain a catalyst component DCat-2 for olefin polymerization. The obtained propylene homopolymer was dried, weighed, and analyzed. The results are shown in Table 1.

[0132] Comparative Example 3

[0133] This comparative example is used to illustrate the catalyst component for olefin polymerization and its preparation method, as well as the catalyst for olefin polymerization and its application of the present invention.

[0134] A catalyst component was prepared and propylene liquid-phase bulk polymerization was carried out according to the method of Example 1, except that 7.5 mmol of (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofuro[3,2-b]furan and 4.2 mmol of 2-isopropyl-2-isopentyl-1,3-dimethoxypropane were added during the heating process to obtain a catalyst component DCat-3 for olefin polymerization. The obtained propylene homopolymer was dried, weighed, and analyzed. The results are shown in Table 1.

[0135] Table 1

[0136]

[0137]

[0138] As can be seen from the results of the examples and comparative examples in Table 1, the catalyst component of the present invention has a narrow particle size distribution, the catalyst has high hydrogen regulation sensitivity and good polymerization activity, and when used for olefin polymerization, the prepared polymer fine powder content is low, and the catalyst component of the present invention does not contain phthalate compounds (plasticizers).

[0139] Any numerical value mentioned in the present invention includes all values ​​that increase by one unit each time from the lowest value to the highest value if there is only a gap of two units between any minimum value and any maximum value. For example, if the amount of a component, or the value of a process variable such as temperature, pressure, time, etc. is stated to be 50-90, it is meant in this specification to specifically list values ​​such as 51-89, 52-88... and 69-71 and 70-71. For non-integer values, it is appropriate to consider units of 0.1, 0.01, 0.001 or 0.0001. These are just some special examples. In this application, in a similar manner, all possible combinations of numerical values ​​between the listed lowest value and the listed highest value are considered to have been disclosed.

[0140] It should be noted that the embodiments described above are only used to explain the present invention and do not constitute any limitation of the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present invention may be modified as specified within the scope of the claims of the present invention, and the present invention may be revised without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein. On the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. A catalyst component for olefin polymerization, characterized in that The catalyst component comprises the reaction product of: (1) A magnesium-containing solid component; (2) at least one titanium-containing compound; as well as (3) Internal electron donor; Wherein, the internal electron donor contains a furan compound and a diether compound; The magnesium-containing solid component is a magnesium-containing compound represented by formula (I): In formula (I), R1 is a C1-C6 straight chain or branched alkyl group; R2 and R3 are the same or different and are independently hydrogen or a C1-C5 straight chain or branched alkyl group, wherein the hydrogen on the alkyl group may be optionally replaced by a halogen atom; X is chlorine or bromine; m is 0.1-1.9, n is 0.1-1.9, m+n=2,0 <q≤0.5。 2. The catalyst component according to claim 1, characterized in that The preparation steps of the magnesium-containing solid component include: (a) mixing and heating sulfur, a magnesium halide of the general formula MgXY, a compound of the general formula ROH, and an optional inert liquid medium to obtain a liquid mixture; (b) emulsifying the liquid mixture obtained in step (a), and contacting the emulsified product with an oxirane compound for reaction; And / or, in the general formula MgXY, X is halogen, Y is halogen, C1-C6 alkyl, C1-C5 alkoxy, C6-C 10 Aryl or C6~C 10 and / or, in the general formula ROH, R is a C1-C8 alkyl group or a C3-C8 cycloalkyl group; and / or, the structure of the oxirane compound is as shown in formula (II): wherein R5 and R6 are each independently hydrogen, C1-C5 alkyl or C1-C5 halogenated alkyl; And / or, in step (a), the heating conditions include: temperature of 80-120° C., time of 0.5-5 hours; preferably, the temperature of 80-100° C., time of 0.5-3 hours; And / or, in step (b), the contact reaction conditions include: temperature of 50-120° C., time of 20-60 minutes; preferably, the temperature is 60-100° C., time of 20-50 minutes.

3. The catalyst component according to claim 2, characterized in that Based on 1 mol of magnesium halide with the general formula MgXY, the amount of sulfur is 0.0001-0.1 mol, the amount of the compound with the general formula ROH is 4-30 mol, the amount of the ethylene oxide compound is 1-10 mol, and the amount of the inert liquid medium is 0.8-10 L; preferably, based on 1 mol of magnesium halide with the general formula MgXY, the amount of the compound with the general formula ROH is 6-20 mol, the amount of the ethylene oxide compound is 2-6 mol, and the amount of the inert liquid medium is 2-8 L; and / or, the sulfur is anhydrous sulfur or sulfur containing crystal water, preferably sulfur, sulfur bromide or sulfur iodide, more preferably sulfur; and / or, in the general formula MgXY, X is chlorine or bromine, and Y is chlorine, bromine, C1-C5 alkyl, C1-C5 alkoxy, C6-C 10 Aryl or C6~C 10 Preferably, the C1-C5 alkyl group is methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl or neopentyl, the C1-C5 alkoxy group is methoxy, ethoxy, propoxy, isopropoxy, butoxy or isobutoxy, the C6-C 10 The aryl group is phenyl, o-tolyl, m-tolyl, p-tolyl, o-ethylphenyl, m-ethylphenyl, p-ethylphenyl or naphthyl, and the C6-C 10 The aryloxy group is phenoxy or naphthoxy; preferably, the magnesium halide of the general formula MgXY is one or more of magnesium chloride, magnesium bromide, phenoxymagnesium chloride, isopropoxymagnesium chloride and n-butoxymagnesium chloride; and / or, in the general formula ROH, R is a C1-C8 alkyl group, preferably, the C1-C8 alkyl group is methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl, neopentyl, hexyl, isohexyl, heptyl, isoheptyl, octyl or isooctyl, preferably, the compound of the general formula ROH is one or more of ethanol, propanol, isopropanol, n-butanol, isobutanol, amyl alcohol, isopentanol, n-hexanol, n-octanol and 2-ethylhexanol; And / or, the oxirane compound is one or more of ethylene oxide, propylene oxide, butylene oxide, epichlorohydrin, epichlorohydrin, epibromohydrin and epibromobutylene oxide; and / or, the inert liquid medium is silicone oil and / or an inert liquid hydrocarbon solvent, preferably, the inert liquid medium is one or more of kerosene, paraffin oil, vaseline oil, white oil, methyl silicone oil, ethyl silicone oil, methylethyl silicone oil, phenyl silicone oil and methylphenyl silicone oil, preferably white oil; And / or, the average particle diameter of the magnesium-containing solid component is 12 to 30 microns, and the particle size distribution is less than 1.2, preferably 0.2 to 0.

8.

4. The catalyst component according to claim 2 or 3, characterized in that Based on the amount of the internal electron donor, the total content of the furan compound and the diether compound in the internal electron donor is 70 wt % to 100 wt %, preferably 80 wt % to 100 wt %, more preferably 90 wt % to 100 wt %, and most preferably 100 wt %; and / or, the molar ratio of the furan compound to the diether compound is (0.1-1.5):1, preferably (0.15-1.2):1, more preferably (0.2-1.0):1; And / or, the furan compound is selected from at least one of the furan compounds represented by formula (III): In formula (III), R1 and R3 are each independently selected from hydrogen, C1 to C 20 Straight or branched alkyl, C3~C 20 Cycloalkyl, C6~C 20 Aryl, C7~C 20 Arylalkyl or C7~C 20 R2 and R4 are each independently selected from C1 to C 10 Straight or branched alkyl, C3~C 10 Cycloalkyl, C6~C 10 Aryl, C7~C 10 Arylalkyl or C7~C 10 Alkaryl; Preferably, the furan compound is selected from (3R,3aR,6S,6aR)-3-methoxy-6-propoxyhexahydrofurano[3,2-b]furan, (3R,3aR,6S,6aR)-3-methoxy-6-ethoxyhexahydrofurano[3,2-b]furan, (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofurano[3,2-b]furan, ( At least one of (3R,3aR,6S,6aR)-3,6-diethoxyhexahydrofurano[3,2-b]furan and (3R,3aR,6S,6aR)-3,6-dipropoxyhexahydrofurano[3,2-b]furan; More preferably, the furan-containing compound is (3R,3aR,6S,6aR)-3,6-dimethoxyhexahydrofurano[3,2-b]furan; and / or, the diether compound is selected from at least one of the diether compounds represented by formula (IV), R 1 R 2 C(CH2OR 3 )(CH2OR 4 ) Formula (IV) Among them, R 1 and R 2 Each independently selected from hydrogen, C1-C 20 Straight or branched alkyl, C3~C 20 Cycloalkyl, C6~C 20 Aryl, C7~C 20 Arylalkyl and C7~C 20 One of the alkylaryl groups, the groups may be optionally bonded to form a ring; R 3 and R 4 Each independently selected from C1 to C 10 The alkyl group; Preferably, the diether compound is selected from 2-(2-ethylhexyl)-1,3-dimethoxypropane, 2-isopropyl-1,3-dimethoxypropane, 2-butyl-1,3-dimethoxypropane, 2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-1,3-dimethoxypropane, 2-phenyl-1,3-dimethoxypropane, 2-(2-phenylethyl)-1,3-dimethoxypropane, 2-(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-(p-chlorophenyl)-1,3-dimethoxypropane, 2-(diphenylmethyl)-1,3-dimethoxypropane, 2,2-dicyclohexyl-1,3-dimethoxypropane, 2,2-dicyclopentyl-1,3- dimethoxypropane, 2,2-diethyl-1,3-dimethoxypropane, 2,2-dipropyl-1,3-dimethoxypropane, 2,2-diisopropyl-1,3-dimethoxypropane, 2,2-dibutyl-1,3-dimethoxypropane, 2-methyl-2-propyl-1,3-dimethoxypropane, 2-methyl-2-benzyl-1,3-dimethoxypropane, 2-methyl-2-ethyl-1,3-dimethoxypropane, 2-methyl-2-isopropyl-1,3-dimethoxypropane, 2-methyl-2-phenyl-1,3-dimethoxypropane, 2-methyl-2-cyclohexyl-1,3-dimethoxypropane, 2,2-bis(2-cyclohexylethyl)-1,3-dimethoxypropane, 2-methyl 2-isobutyl-1,3-dimethoxypropane, 2-methyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2,2-diisobutyl-1,3-dimethoxypropane, 2,2-diphenyl-1,3-dimethoxypropane, 2,2-dibenzyl-1,3-dimethoxypropane, 2,2-bis(cyclohexylmethyl)-1,3-dimethoxypropane, 2-isobutyl-2-isopropyl-1,3-dimethoxypropane, 2-(1-methylbutyl)-2-isopropyl-1,3-dimethoxypropane, 2-isopropyl-2-isopentyl-1,3-dimethoxypropane, 2-phenyl-2-isopropyl-1,3-dimethoxypropane, 2-phenyl-2-sec-butyl-1,3- At least one of dimethoxypropane, 2-benzyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclopentyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-isopropyl-1,3-dimethoxypropane, 2-cyclohexyl-2-sec-butyl-1,3-dimethoxypropane, 2-isopropyl-2-sec-butyl-1,3-dimethoxypropane, 2-cyclohexyl-2-cyclohexylmethyl-1,3-dimethoxypropane and 9,9-dimethoxymethylfluorene; more preferably, the diether compound is 2-isopropyl-2-isopentyl-1,3-dimethoxypropane and / or 9,9-dimethoxymethylfluorene; And / or, the titanium compound is selected from the group consisting of Ti(OR4) 4-a X a A titanium compound, wherein R4 is C1 to C 14 aliphatic hydrocarbon group, preferably a C1-C8 alkyl group, more preferably a methyl, ethyl, propyl, butyl, pentyl, hexyl or heptyl group; X is a halogen, preferably at least one of F, Cl, Br or I; a is an integer of 0 to 4; preferably, the titanium compound is selected from at least one of titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, tetrabutoxytitanium, tetraethoxytitanium, monochlorotributoxytitanium, dichlorodibutoxytitanium, trichloromonobutoxytitanium, monochlorotriethoxytitanium, dichlorodiethoxytitanium and trichloromonoethoxytitanium; And / or, in the catalyst component, based on each weight part of titanium element, the content of magnesium element is 2 to 18 weight parts, preferably 3 to 16 weight parts, and the content of internal electron donor is 2 to 17 weight parts, preferably 3 to 15 weight parts.

5. A method for preparing the catalyst component for olefin polymerization according to any one of claims 1 to 4, the method comprising: The magnesium-containing solid component is contacted with a titanium compound for reaction, and an internal electron donor containing a furan compound and a diether compound is added.

6. The preparation method according to claim 5, characterized in that: The contact reaction comprises: suspending the magnesium-containing solid component in a raw material containing a titanium compound at -30°C to 0°C, heating to 60-130°C, and reacting for 0.1-5 hours; And / or, the preparation method further comprises: filtering off the liquid after the reaction and recovering the solid, treating the solid with a liquid titanium compound once or multiple times, and then washing the solid with a hydrocarbon solvent multiple times to obtain the catalyst component; preferably, the hydrocarbon solvent is selected from aliphatic hydrocarbons, aromatic hydrocarbons or alicyclic hydrocarbons; And / or, in the preparation method, the amount of the titanium compound used can be 5 to 220 moles, preferably 10 to 200 moles, per mole of magnesium; the amount of the internal electron donor used can be 0.05 to 1.2 moles, preferably 0.07 to 1.0 moles, and more preferably 0.1 to 0.8 moles, per mole of magnesium.

7. A catalyst for olefin polymerization, characterized in that The catalyst contains: (i) a catalyst component, the catalyst component being at least one selected from the catalyst component according to any one of claims 1 to 4 and the catalyst component prepared by the preparation method according to claim 5 or 6; (ii) at least one alkylaluminum compound; as well as (iii) Optional external electron donor.

8. The catalyst according to claim 7, characterized in that The general formula of the alkylaluminum is AlR n X 3-n , where R is an alkyl group having 1 to 8 carbon atoms, and the hydrogen on the alkyl group is optionally substituted by a halogen atom, X is a halogen, and n is an integer of 0 < n ≤ 3; preferably, the alkyl group having 1 to 8 carbon atoms is methyl, ethyl, propyl, n-butyl, isobutyl, pentyl, hexyl, n-heptyl or n-octyl, and the halogen is fluorine, chlorine, bromine or iodine; more preferably, the alkylaluminum compound is selected from one or more of triethylaluminum, triisobutylaluminum, tributylaluminum, trihexylaluminum, diethylaluminum chloride, diisobutylaluminum chloride, dibutylaluminum chloride, dihexylaluminum chloride, ethylaluminum dichloride, isobutylaluminum dichloride, butylaluminum dichloride and hexylaluminum dichloride; And / or, the external electron donor is selected from carboxylic acids, carboxylic anhydrides, carboxylic esters, ketones, ethers, alcohols, lactones, organophosphorus compounds and organosilicon compounds; preferably, the external electron donor is a compound containing at least one Si-OR bond and having the general formula (R 17 ) x (R 18 ) y Si(OR 19 ) z Silicon compounds, where R 17 , R 18 and R 19 Independently C1~C 18 A hydrocarbon group optionally containing heteroatoms, x and y are each independently an integer of 0 to 2, z is an integer of 1 to 3, and the sum of x, y and z is 4; preferably, R 17 , R 18 Independently C3~C 10 Alkyl, C3~C 10 The cycloalkyl group optionally contains heteroatoms, R 19 C1~C 10 alkyl, optionally containing heteroatoms; further preferably, the external electron donor is selected from cyclohexylmethyldimethoxysilane, diisopropyldimethoxysilane, di-n-butyldimethoxysilane, diisobutyldimethoxysilane, diphenyldimethoxysilane, methyl-tert-butyldimethoxysilane, dicyclopentyldimethoxysilane, 2-ethylpiperidinyl-2-tert-butyldimethoxysilane, (1,1,1-trifluoro-2-propyl)-2-ethylpiperidinyldimethoxysilane and (1,1,1-, trifluoro-2-propyl)-methyldimethoxysilane; and / or, the molar ratio of the catalyst component calculated as titanium element to the alkyl aluminum compound calculated as aluminum element is 1:(1-2000), preferably 1:(20-500); And / or, the molar ratio of the external electron donor to the alkyl aluminum compound calculated as aluminum element is 1:(1-500), preferably 1:(2-200).

9. An olefin polymerization reaction, characterized in that: The olefin is polymerized in the presence of at least one of the catalyst component according to any one of claims 1 to 4, the catalyst component prepared by the preparation method according to claim 5 or 6, and the catalyst according to claim 7 or 8; The general formula of the olefin is CH2=CHR, R is hydrogen, C1-C6 alkyl or C6-C 12 The aromatic group.

10. The olefin polymerization reaction according to claim 9, characterized in that: The temperature of the polymerization reaction is 0 to 150° C., preferably 60 to 90° C.; the pressure of the polymerization reaction is 0.01 to 10 MPa, preferably 0.01 to 6 MPa, more preferably 0.1 to 4 MPa.

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